India's regional languages such as Tamil, Bengali, Gujarati, Marathi have a rich history that goes back to at least a 1000 years. The languages have evolved in a natural course, and were standardized not less than 500-600 years ago.
The same is true for Urdu: its literary form (which is intelligible with modern standardized Urdu) also stretches back much earlier than Hindi. Consider the following phrase by Mir Taqi Mir. This couplet is probably from the second half of the eighteenth century, before America was formed.
Dikhaai diye yun ki bekhud kiya
Hamein aap se bhi juda kar chale
Most modern Urdu speakers (as well as Hindi speakers) will be able to understand the above paragraph's meaning. In fact, a rendition of this poetry was used in a popular Bollywood song of the '80s from a movie called Bazaar, sung by Lata Mangeshkar. So, literary Urdu had to be nominally replaced by standard Urdu. I am not denying that Urdu borrows 75% of its vocabulary from indigenous Indian languages such as Pali, Prakrit, Sanskrit. But many of the higher vocabulary and concepts come from Persian and Chagatai Turkic words.
In comparison to Urdu, Hindi was formed more recently. Please read Tulsidas, Surdas, and a few other "Hindi" authors who actually wrote in dialects like Brij, Awadhi etc. No Hindi-speaker can understand the meaning of their works without a translation.
This goes with my earlier theory that standardized Hindi language was a recent creation, and the credit goes to British East India company officers. They aimed to design an artificial language to communicate with the Hindu masses (Urdu already existed for communication with the Muslims).
All literate Hindus of the 19th century from Punjab to Bengal, could write their thoughts in fluent Urdu. It was the only "national" language of Northern India.
Then this pretender to the throne came after India became independent in 1947. It was called Hindi, of course - even Pandit Jawaharlal Nehru had a personal dislike of Hindi as he too had been educated in Urdu. Mahatma Gandhi also spoke fluent Urdu.
One of the famous moderators here thread-banned me for expressing these views in another thread (I will not name him).
Now this perversion will continue under Modi-Raj.